Can anyone recommend a firm for cross-browser testing?

[CityWonders]

I'd like to outsource the cross-browser testing and get complete functionality testing across browsers too.  I work for an online travel tour operator, so we take a lot of reservations online.  I don't totally trust my internal resources using tools like Selenium because we're adding a lot of new functionality to our new site - saved itineraries, wish list, some upselling and cross selling functionality, selling insurance, etc.  So, while of course I want to be sure everything renders properly across browsers, I also feel like the investment in having someone check booking process in all browsers/technologies is critical especially since many of our customers are accessing our sites using older browsers.

Thoughts??

[GlobeCar]

try to discuss the environment with this company..  http://www.softheme.com/independent-testing